Now go back to "Site Setup", select "Dexterity Content Types" and start tinkering with it.

Then create a new content type called 'Person'. You can do this by clicking 'add new content type' (see the screencast below):

That's it.

Creating a content type with filesystem code

Now that you've seen the through the web (TTW) approach, let's look at storing code on the filesystem. The filesystem based approach is better for version management (e.g. with git) and redistribution of the code.

To make your life easier, I've created some boilerplate code based on the dexterity manual. The instructions below will get you started quickly (assuming you already have Plone and git installed).